Preparation method of wide-temperature high-efficiency non-toxic SCR (Selective Catalytic Reduction) catalyst and application thereof

Abstract

The invention discloses a preparation method of a novel wide-temperature high-efficiency non-toxic SCR (Selective Catalytic Reduction) catalyst and an application thereof. The general formula of the catalyst is AxFe(3-x)O4, wherein x is less than or equal to 1; and A is one or a combination of titanium, magnesium, manganese and nickel. The wide-temperature non-toxic iron-based denitration catalystis prepared by a coprecipitation method, the cost is reduced, and the defects that the traditional Fe-based SCR catalyst is low in denitration efficiency, narrow in temperature window, poor in stability performance and poor in selectivity can be effectively overcome. Under the conditions that the temperature is 200-450 DEG C, the air speed reaches 3000-200000h<-1> and nitric oxide flue gas contains 0-2700mg / m<3> of SO2 and 0-20% of water vapor, the denitration efficiency of the catalyst is stabilized at 90% or higher, and the N2 selectivity is stabilized at 95% or higher. The catalyst disclosed by the invention is applicable to nitric oxide emission control of fixed source flue gas in thermal power plants, coking plants and the like.

Description

technical field

[0001] The invention relates to an SCR catalyst and a preparation method thereof, in particular to a wide-temperature high-efficiency non-toxic SCR catalyst and a preparation method thereof, belonging to the technical field of air pollution control. Background technique

[0002] China is a big coal consumer, with coal consumption reaching 3.779×10 in 2016 9 t, of which about 50% is used for power generation. Pollutants emitted from coal-fired power plants are particulate matter, sulfur dioxide, and nitrogen oxides (NO x ) mainly. The discharge of nitrogen oxides into the atmosphere will cause problems such as acid rain and photochemical smog, and cause serious damage to the environment, crop growth and human production and life. Since 2015, my country has fully implemented ultra-low emission and energy-saving transformation of coal-fired power plants, and strictly controlled the emission of nitrogen oxides from industrial sources. For example, "ultra-low ...